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Finding the Fourth Proportional to 381.58, 571.14 and 198.72

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Solution

The fourth proportional to 381.58, 571.14 and 198.72 is: 297.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.58 : 571.14 = 198.72 : x
  2. Step 2: Convert to fraction form
    381.58/571.14 = 198.72/x
  3. Step 3: Cross multiply
    381.58x = 571.14 × 198.72
  4. Step 4: Simplify right side
    381.58x = 113,496.94
  5. Step 5: Solve for x
    x = 113,496.94/381.58
  6. Step 6: Final answer
    x = 297.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.